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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2836e4f1eca8d9f7bc379774f2404f48e8c29b26bddca946dd328f23c8c9527b' 
  AND token = 'nNmcoHkAr+Dl7fiTvktTR2GDiIrhnJltZpUekOMIsOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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