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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2a6573ec2234b6d6ba96503699e74100900b1c5a3a1f8e5e9fab91b7d4a2f8' 
  AND token = 'uLh2upjl0wVBMDr1nNzaIOkRyHu7F4r1va7A6S8Sm0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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