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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d6fe66e18d16a65d310d7f4900bdace7c81f156d240c261154e2361f483231' 
  AND token = 'T7FXlF2s3rHitlQG8Qhc4wDMTBVQFdSbLfsMXg/mBB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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