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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985455fbb966b6e1a913c9d6ce7e05ec3a49277deebcc9dcede99945449e276e' 
  AND token = 'ixA5Ma0140w4PrduFMFhDbG7zy+uc7+i8wyyf5Ixmcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}