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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab893cda060d59610fd67bac940f310ed44fd19f97d0a3eeffb98fed60213e1' 
  AND token = 'nKryIp21W4dAqeP9obD9GY8imxQszbnHRBiPuqrIfmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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