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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94dba9a1c39867d4bad67f5342851357921cac81b966046f8df5244e22744fb9' 
  AND token = 'roSCQD0hP4P0bKT/MeRwazjOp4nJ8nfBTkWtr9Am+8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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