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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a397c0271fc98a0bb9b96a192abc8c10893328b416eaac326db787ea83dc2e6' 
  AND token = 'PTa6eje+M71FlqD65VzhbydRRlZpfA6UACsllNMIRjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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