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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309fcd4ef01812b06de8cd99b8370cd5eba0fc763758500220c6e7839801cf5e' 
  AND token = 'ng22sLYTr1jNZvCpHL7YXG20mEP3fU/2PrOG5SrE/cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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