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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3392ed902f120b71dacd3ed6076d653472e440a804316dcb8fac4a09a195ad8' 
  AND token = 'GznM7/m2EOEatOvfD2TRgxN39OnvEnxEb5M2V/59jYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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