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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7c88329d04f402326acc388d076973a535b3bc28ba186655dea596b5419b6e' 
  AND token = 'V83t+sw1OpJnqI732z5pp5g80C79QQyYi+fUWWt1P94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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