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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60471aa398b9812d59017bb291870815c5c0a5394bf775ebd6ab45fa9d3ad450' 
  AND token = 'zK6yaW4AwA8jen/OKshRHdQlw3I8nUam9RtF20SerS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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