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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc98b9d5b0e36c77d4b25ccc2aa822e5684b2151dae72560b802dd381944ed17' 
  AND token = '/7gtqG5uSAmHOSN7ai5G7actQYlgohHYAnYX+NTj3Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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