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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1c04b2c5380094f86d4acc921f23c3a7cac750ef7800b9997e23180b684df1' 
  AND token = 'yK5oWz6JzuV712IL3KN52rOXpUyisQBxyUaMxZaniGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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