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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf7cb90ff54e479c5e181d7f07b5f67c66c1263da34f52e76a3c28016fbe4d5' 
  AND token = 'HvjWp+SuRg7ipzZdgcyi0e/zrsyNU1mS0A3gyRyBVvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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