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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61eb7e7e8e05e96e24cd0963f54d2dce3f828040049e339111c7deee3afc134d' 
  AND token = '9G651p9ud1CXpuHo46whJAyymHz4tQ26WlBB0Rul8FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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