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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb64491f7279f9dc9e7a49219f9b3dbb309f91063b4d92655f4a53078052f98' 
  AND token = 'GFnBfHS18hp2cgoV08C8+Qj0VIakx4SUX0KdkGMaa0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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