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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32a07138ee1f1f8bb0e45b0d4cfb4aa3e868fe23ec8ca2002320cafa1238fc6' 
  AND token = 'RLlH8CpXXOKzF9JOntnICId50ZKnX7V47Z6EvjzPudc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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