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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f1ca0ec3a800ccce8a793ebd99c01e1ca454caec146d0805bb5e6a8fdcf3e9' 
  AND token = '4y15tuohVkrfvBTPBHFhv3H4eIhQaPgvDs1V85I8PXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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