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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4522ede29144a8070570faf192b35610db322b80d96c5710d56b1f4202c1d3c0' 
  AND token = '3ar1v/6LLPgW2KXIcfrrxmV9KEShMqVBCRSxRwHanJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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