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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '493d32691cb3f88bd9b1674f532f089fc8407bad095e07a5a4cde14531813920' 
  AND token = 'OHIb/Z/BfSBmOxD0oa47r1FpD1E5kyS0BoOCfpRlHsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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