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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be46b03edb6b05583b3aeb44e01a13b4a5a0e352e1a770585f1a86bf7877f7c9' 
  AND token = 'wXUIdFYTXm4miyTJiuLg2zZgajMfAoRmg8fQH6oZ7No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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