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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e48e792010a8fcc930a1c9b0def4ae83289c2fe0e97e9e1bd8e588979dd6bf4' 
  AND token = 'xH/UbZbFyXbO/a279gRGkZJKz5/fVMppaey1TMT4eg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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