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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938d46f2098e3c0107eca116217e8c5380563deb5f21ea2c497fba6b8f4520f2' 
  AND token = '1Za1V3EUrGIwFoaywtCZRjFvVgTriw+Q/SN31CUr/3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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