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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9507eb71add45fa8fb8954204bfc2e78f410c1d8981bdfe60c0bb9df4e97c1' 
  AND token = 'K6ByyMIvpGKJaR2zMshF9JEs9qVkkMjHTW1rb/vHBiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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