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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '331e1e173a22e0e739c6e4c9d04d72dde08c079302d69bd390f4f0e2dff6cff3' 
  AND token = 'pkqar9LdQuNec7FI3bqDd5Wx5bniSKViuQ7d8+A6+h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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