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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62f0a00d1d654f2ce397f6d5f84646151f553985300ad33ccfeea573cea3fe1' 
  AND token = 'gf5rNFt7p9BDDYhczWxvXWND2CQhlqqApGfgAfhXQYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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