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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d07d45b2270dcfec6d918b1bb26782eff43b512bade740edc94e64b1a7fae1' 
  AND token = 'kdsRBUC/0j4fArr1jwjDfYrcnV4MzwKttDj96aL1EJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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