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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb98b45ca6c80de84193ec38673f16865fd48d17024cdef4f5f8c9e833b0ff28' 
  AND token = 'dct6c0EWBw7Cwseb8h7HxM8xMUnmf6KtZ9q4BqJrIzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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