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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8028b12bec7ee7367fd8010630f2108484aa91b97ed9111226a379eb505a7240' 
  AND token = '9uRvtbVI2lpEqs4YjqAU0ySW0px4w7pkdn7AgI4yOb8=' 
  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"
    }
  }
}