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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994daba54c5f06aa1b375a1ba24568cfcb20793a98def65c56edf9e1b2c8b126' 
  AND token = '2q8S0uBPr+y+IqTqOYN1mbYymrwiXqRr6j9ONv/lC0I=' 
  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"
    }
  }
}