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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3ba799a873c3f5392f6992ece052ec14c1adead4098b4e7735504ea024ad9f' 
  AND token = 'zobyOPoEtWj+tNZqC5QdJrQN9vCaLjqVcJHFDtFNT1g=' 
  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"
    }
  }
}