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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94fec1a8708fd6e691f26db1f300796c7c6d126ac3f60fa41719e6130136916' 
  AND token = 'EiVVANbmzmmT5XhSKGOzqHkYrIjJx2C4XiK7HZI3rrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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