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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca622a468c16e79bfd1778b7a83d3a58ed254f86bdec790574820fdc59cf2fb' 
  AND token = 'Y7jzBqICIN3I4EI5Mwyy772gov+/ZUz0Rv5F5zfMljE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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