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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca9e9f163dd06b2d4f74c2bd769bce0c45c00e71655f79dc348f4a551df3d35' 
  AND token = 'mDOWx1vCHHAun8i8+5o7AqdIVUExAU1Rc0HZWYHZn/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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