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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012681d7e0d9786bd7998e799885b4fdc0f914124b04f80dab30e21706ed9db0' 
  AND token = 'dKOb1RtbGA3lAkU300p771PyjkuAES9xOWX7q5VXL3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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