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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2bbee0fe5af92dd2d0ba225c09293f1afab5e481515fb4097cf2eb5aa0928ad' 
  AND token = 'nECwoDxvDzVySXYVWSNpm7zAQO+Ykw8DDzB+FAmgAp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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