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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c1b3c13056ddea80c19a848d449253f7294e663e23352a278a6168a40ea462' 
  AND token = 'X2H1ta/Y3JkpV0rK3QF3mzLXeoG651/9+L20iDMlJAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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