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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba7825ef3d8613c5d28b8401c75a512e39a1fe86832f73977e57845beaffe52' 
  AND token = '8DcUrAjIjHAQq8T4WV69d2/29e+ErkXyCAoJIxa3mR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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