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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93900f99003080fbee74e618997b220005b74817d1b24d2c4b6de0f03c8a6843' 
  AND token = '2H00gG60jZNFwZ1/OtTTZ+4Grcy9/nHzCKq6Mypoc9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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