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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e62e74e13fe7494c257ebe593df842701c2a37053f16c7bef09b25cccf7a78' 
  AND token = 'Ef5HksdsL/rCcgkIbAX52/KwP8n2PyPPqQG9XwtfF9U=' 
  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"
    }
  }
}