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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '561e9c857077d30954b0c7a9705d55976741dc1f3d0e80913aa72b5f26786f55' 
  AND token = 'O/WHB0kAj83GXelZSoVorfcMCj3obO5e6IAEhde6n5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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