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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59c157f4dee0122b0c6d053fa7bd54ce28dabf2d4b3854e765b58a6f6dbd9cbf' 
  AND token = 'TuBINOb2MUkAEPCdsCxEw0G1iS9plviUUrARIO7egSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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