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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad4d4842beb5ea4a247e5e5bf4d0b55bb8687c0affebe729e5ade0926161c99' 
  AND token = 'eJyxIufFKAC7kmL3JuQxl38X0HABsZ6mDXaPavTLNbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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