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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28778c4d0b2269730adfccd90ece345ae6eac6edfcc4ef2dcf5c6bc60d3a4711' 
  AND token = 'Jya1i/NqL4M/wMBNCAV5ElouF+ibaf9bk9aj9T5ZyCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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