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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1764a0d196678c0ea1dcdfd7763a264d892cd8035892204878c24033fd941a93' 
  AND token = 'Zy4b7y3Hl+pFqw3kwvNKBxSvlZ7RODMT8gIQfj0RR5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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